Ian Pratt recently was on stage during the keynote sessions at Citrix Synergy showing the current implementation of the Type 1 Xen client hypervisor running on a PC and Mac. He did the demonstrations with Patrick Gelsinger from Intel.
The complete 45 minute Intel presentation is at http://www.citrix.com/tv/#video/423.
To see Ian demonstrate the Windows Xen client go to 27 minutes 30 seconds. To see Ian demonstrate the Mac Xen client go to 42 minutes as Mark Templeton joins the stage.
For more information on the Xen Client Inititiave in the Xen.org open source community, go to http://wiki.xensource.com/xenwiki/General_Project_Information. The complete source code of the current XCI is at http://xenbits.xen.org/xenclient. If you have any questions on the open source Xen.org community, please let me know at firstname.lastname@example.org.